I recently picked up a barrel lens Xenar 180mm that I plan to put in shutter. Before I dismantle it though, curiosity got the better of me and now I'm wondering what behemoth of a camera uses a mount like this. It's made out of solid iron or steel. As you can see, it has a square end to the mount. Any idea what this lens has been attached to? The serial number dates it to about 1960.

04-11-2011, 09:54 AM

jnanian

hi shnitz

i can't suggest what kind of camera, but
it looks to me to be what is sometimes called a "top hat lensboard"
used because the camera didn't have enough bellows to use the lens.
maybe the lens was used to do macro photography and this board allowed
for 1:1 or larger reproduction.

have fun with your new lens !
john

04-11-2011, 09:54 AM

Ian C

That is a long extended lens mount used to place the lens at the proper distance from the film to attain focus in a large commercial enlarger, or more likely, a lithographer’s process camera used in the steps to convert photographic images into lithography printing plates.

04-11-2011, 11:26 AM

shnitz

OK, thanks a lot. It's so heavy, I thought it might be for some kind of enlarger rather than a camera, but I wasn't sure. I know that Xenar means that the lens was produced as a taking lens, so I assumed that if it was an enlarger, it would be a Componon lens. Is there any difference between them? For example, are there any drawbacks to using this Xenar as an enlarging lens, and would an enlarging lens like a Componon work fine if I somehow mounted it for photographic use?

04-11-2011, 12:09 PM

Ian C

The Schneider Xenar is a 4-element Tessar design camera lens. It isnít a good choice for enlarging as it isnít designed to produce a flat field of focus forward of the lens as an enlarger, process, or macro lens is.

I wonder if there are any other markings on the lens to possibly indicate that it was a variant designed for close-focusing flat-field copy work. The 4-element 50/4 and 75/4 EL Nikkors are examples of Tessar type enlarging lenses that work very well. So the idea that you might have a variant for flat-field close-up work is at least plausible, but I donít know.

A Schneider Componon is a 6-element double Gauss flat-field enlarging lens and that makes it a good process or macro lens as well.

All lenses must produce a flat field at the plane of the film, but only enlarger, process, and macro lenses are designed to produced a flat field forward of the lens. In contrast, most camera lenses produce a slightly curved field of focus (bellied out like the front glass) forward of the lens.

Process cameras were used in a variety of ways, not always in photographing strictly flat originals. In one of my reference books a large horizontal process camera is shown photographing a large 3-dimensional piece of artwork well forward of the camera. In such an application the lens neednít be the usual flat-field lens usually employed on a process camera.

We can only speculate on how the lens youíve shown was employed. The fact that itís mounted in a barrel, and not in a shutter, indicates that it was most likely used on a process camera or enlarger. The exposure was most often flash or tungsten photo-floodlights on a digital timer in a large darkroom. If the lens is a standard-design Xenar, then itís unlikely that it was used for enlarging.